TW201042600A - Method for driving fluorescent display tube and fluorescent display tube - Google Patents

Abstract

This invention provides a method for driving a fluorescent display tube and a fluorescent display tube, by which the luminance life time of a fluorescent display tube driven by a dynamic drive style and using a fluorophor having significant luminance saturation can be increased. The method for driving a fluorescent display tube comprises dynamic driving of a fluorophor layer formed on an anode electrode, while excited by a low-velocity electron beam. The fluorophor included in the fluorophor layer increases the luminance with a shorter pulse width under the condition of the same Due in dynamic driving, and after the luminance of the fluorophor is saturated by applying a voltage to the anode electrode followed by stopping the application of the voltage, the time period until the luminance decreases down to 10% luminance of the saturation luminance is 200 μ sec or longer. The dynamic driving, while increasing the repeating cycle of the pulse or pulse width in the driving period, is variable at the initial luminance direction maintained by the fluorophor.

Description

[Technical Field] The present invention relates to a method of driving a fluorescent display tube and a fluorescent display tube using the same. [Prior Art] As a low-speed electron beam excitation phosphor such as a fluorescent display tube, in addition to ZnO: Zn (green) which exhibits excellent luminescent properties, SrTi03 : ρ Γ (red), CaTi03 : Pr (red) ), Gd2〇2S: Eu (red), Y2〇2S: Eu (red), La202S: Eu (red), Sn02: Eu (orange), ZnS: Μη (orange), ZnGa204 (blue, ), ZnGa204: Phosphors obtained by adding a conductive material such as Ιη203 to Μn (green) or the like have also been extensively researched and developed. However, the phosphor which has been developed as a low-speed electron beam excitation phosphor has a shorter lifetime than the green ZnO: Zn. On the other hand, a dynamic driving method is known as a driving method of a fluorescent display tube. In this dynamic driving, if the duty cycle (hereinafter referred to as Du) is set, the luminance may be substantially the same by changing the pulse width tp, and the luminance may be lowered. Here, Du is expressed by a ratio (tp/T) of the pulse width tp to the repetition period T of the pulse. The brightness of the fast-responding phosphor is about the same, and the brightness of the slow-responding phosphor is reduced. The response speed is expressed as the time from when the voltage is applied to the anode to when the phosphor reaches saturation brightness. In addition, in response to a slow-speed phosphor, the brightness is lowered because the -5 - 201042600 is less than the saturation brightness during voltage application. Thus, in order to obtain the necessary brightness, it is disadvantageous to use the dynamic driving of the phosphor having a slow response speed (Japanese Patent Laid-Open Publication No. 2000-250454). Therefore, when a phosphor having a slow response speed is used, it is avoided that the repetition period T of the pulse is excessively shortened (i.e., the pulse width is shortened) so that the repetition period T is 8 to 20 msec. For example, when Du = 1/10 to 1/50 and T = 10 msec, the longer pulse width of 200 to 1 000 psec is used as the pulse width tp. In addition, in order to prevent flickering of the display screen, it is desirable that the repetition period T is 10 msec or less, in the case of the vibration of the fluorescent display tube. (Edited by Kishi Noki, "Fluorescent Display Tube", p. 155, issued by Industrial Book Co., Ltd.) In the dynamic driving described above, if the pulse width is lengthened, there is a possibility that display flickering, uneven brightness, and the like may occur, and display quality may be degraded. A method for improving the fat burning life of a fish-light body in dynamic driving is described in Japanese Patent Laid-Open Publication No. 2003-95-81. The purpose of this method is to prevent uneven brightness and brightness in parallel with the cathode in the fluorescence display, especially with rib_grid electrodes. It adjusts at least one of a pulse width and a voltage of a driving pulse applied on at least one of the anode and the gate in relation to a distance from the cathode to the anode thereof and increases to the cathode if the cumulative working time is extended Distance method related to pulse width and voltage adjustment amount. In addition, a fluorescent display tube driving device is also known, which is characterized in that: -6 - 201042600 includes: driving means for dynamically driving the camp light display tube to be driven by a driving voltage required to drive the fluorescent display tube; The temperature detecting means of the working environment temperature of the means; and the temperature detecting result of the capable detecting means, the voltage of the anode supplied to the anode electrode of the fluorescent display tube in the driving voltage becomes a voltage variable means of the desired enthalpy (Japanese Patent Laid-Open No. 1) In the case of the low-speed electron beam excitation phosphor, the fluorescent display tube using these phosphors has been put into practical use. In addition to the green light, the phosphor used in the display tube has been put into practical use. ΖηΟ: In addition to the body, even if the above-described improvement method is carried out, most of the phosphors have a short life. Therefore, the brightness of the fluorescent display tube is required to be higher, and the present invention is to solve the problem. The above-mentioned problem is proposed to be driven by a dynamic driving method, and it is possible to use a phosphor that achieves a remarkable saturation. Driving method of fluorescent display tube and brightness lifetime and firefly driven by the driving method (means for solving the problem) The driving method of the present invention is carried out by performing a phosphor layer formed on a low-speed electron beam anode electrode Dynamically driving and displaying, using the drive, the drive is based on the temperature to the desired voltage). Various kinds of fluorescent light Ζ ι 营 营 营 是 是 营 营 营 营 营 营 营 营 营 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 The phosphor is a phosphor that increases brightness when the pulse width is shortened under the condition that Du is the same under the above-described dynamic driving, and applies a voltage to the anode electrode, and after the luminance of the phosphor is saturated. 'The phosphor that has been reduced to 10% of the saturation brightness 値 after the voltage application is stopped is 200 psec or more; the dynamic drive is a fixed anode voltage, a gate voltage, and a duty cycle, using pulse width or pulse The repetition period of 値 controls the brightness to drive. The method is characterized in that, for the pulse width or the repetition period of the pulse period, the pulse width or the repetition period of the pulse is maintained in the direction of maintaining the brightness of the phosphor, especially during the initial period, while the driving time is increased. The direction of the brightness can vary. Further, it is characterized in that the anode voltage, the gate voltage, and the duty cycle maintain the enthalpy at the start of driving. Another dynamic driving feature is that the pulse is repeated with a repetition period of 7.5 msec or less and a pulse width of 150 psec or less. It is characterized in that the precursor of the phosphor used in the driving method of the present invention is Cai.xSrxTi〇3 (〇Sx<l), L112O2S (Ln represents Y, La, Gd or Lu), and Ln203 (Ln represents Y, La, Gd or Lu), ZnGa2〇4, Zn2Si04, Zn2Ge04, Sn〇2, ZnS or CaS. Further, it is characterized in that the phosphor is a phosphor having a localized luminescent center. Further, the phosphor is a phosphor having at least one of a transition metal ion emitting center and a rare earth ion emitting center. In particular, the above-mentioned luminescent center is Μη ion, Pr ion, Eu -8 - 201042600 or Tb ion. Further, the above-mentioned phosphor ZnGa204: Mn, SrTiO3: pr, CaTi〇3: Y2O2S: Eu, ZnGa2〇4, Gd202S: Tb,, :Eu, Sn02: Eu, Zn2Si04: Mn, CaS: , A1 At least one phosphor selected in the middle. The fluorescent display tube of the present invention is a fluorescent display tube that ejects a low-speed electron beam onto a phosphor layer formed on a vacuum layer and emits light through the phosphor layer. (Effects of the Invention) According to the dynamic driving method of the present invention, when the pulse width is shortened under the use conditions, the brightness enhancement degree 10 10% of the luminance 値 time is 20 (^sec to drive the 'fixed anode voltage, gate voltage It is driven by the 〇 of the duty cycle or the repetition period of the pulse, and the brightness is lowered to extend the life of the fluorescent display tube. In particular, by making the pulse repetition period a pulse width of 150 psec or less, even if it does not change It is possible to greatly improve the luminous efficiency (brightness). When the driving time is increased, the operation of increasing either of the positives Du can also increase the brightness, and the energy of the electrons colliding with the phosphor increases. Acceleration, the result cannot be from ZnS: Μη, Pr, Gd2〇2S · Eu, f2〇3 : Eu, La2〇2S Mn, and the anode electrode in the ZnS: Au container is driven by the above dynamics so that Du is set to be the same, And the dynamic cycle of the phosphor which is reduced to the saturation light can be greatly suppressed by 7.5 msec or less by using the pulse width, and I Du, that is, the same drain voltage and gate voltage as the power consumption. In addition, the brightness is increased by the increase in the number of electrons. In addition, -9 - 201042600 also causes an increase in power consumption. However, the driving method of the present invention can increase the brightness without changing the above operating conditions, so that the phosphor is not accelerated. The deterioration of the fluorescent display tube does not increase. [Embodiment] The driving method of the present invention relates to a dynamic driving method of a fluorescent display tube. Fig. 1 is a cross-sectional view of the fluorescent display tube. The tube 1 has a phosphor layer 6 formed on each of the plurality of anodes 5 in the display surface of the anode substrate 7. It is a display tube, that is, a cathode 9 located above the phosphor layer 6 in a vacuum space. The generated electrons are controlled by a plurality of gate electrodes 8 provided between the egg light layer 6 and the cathode 9, and the plurality of phosphor layers 6 are selectively illuminated. In addition, in Fig. 1, 2 is a glass substrate, 3 It is a wiring layer formed on the glass substrate, 4 is an insulating layer, and 4a is a through hole electrically connecting the wiring layer 3 and the anode electrode 5. Further, 1 is a front glass, and 11 is a barrier glass. Dynamic driver Fig. 2 is a timing chart in the dynamic driving method. The dynamic driving method is to sequentially apply an acceleration voltage higher than the potential of the cathode 9 to the plurality of gate electrodes as a pulse voltage of a digital signal (gate scan) and perform scanning. In synchronization with the timing of the scanning, a lighting voltage higher than the potential of the cathode 9 is selectively applied to the predetermined anode 5 in accordance with the display type, and is a pulse voltage of a segment signal of Ο N (positive) or 〇 FF (negative). Fig. 2 shows the arithmetic number by the segments a to g. According to the dynamic driving method of -10-201042600, the gate electrode 8 is provided for each predetermined illuminating cut. In addition, a predetermined predetermined position of the plurality of anodes 5 is determined. The anodes 5 are respectively connected, and the gate electrode 8 is used as a number of selection electrodes and electrodes. In Fig. 2, T is the impulse width of the period, and U is the blanking time (blanking time 〇 to Τ ratio (tp/T). In the above dynamic driving method, due to the type of low-speed body, for Du Significant dependence is indicative of the luminous efficiency of the ZnO: Zn phosphor, and 4 is the luminous efficacy of the ZnS: Μn phosphor.

. For the ZnO : Zn phosphor, even if the current incident on the Du change increases or decreases, the luminous efficiency is different. For the ZnS : Μ 萤 phosphor, if the current incident on the Du Ο is increased, the luminous efficiency is greatly improved.

The ZnS: Μη phosphor is driven by a long pulse width in response to a slow-speed drive, like a rise in luminescence. However, the inventors have found that for ZnS: fixed phosphors, even in the case of Du, the luminance (luminous efficiency) of tP is greatly increased. For ZnS: Μn phosphor or the like, the anode 5 for each of the illuminating and sharing anodes in a predetermined unit (light-emitting group) is used as a segmentation repetition period, tp is a pulse 1) 'Du is defined as tp electron The beam is excited by the fluorescent division. For example, the dependency of Figure 3 Du, the dependence of the rate on Du, 艮P, hardly changes even for fluorescence. This increases, that is, if the fluorescence is low. Therefore, in the case of the existing 200-lOOOOpsec Μn phosphor, etc., if the pulse width is shortened, this can be greatly improved by the shortening of the pulse width in the case of [Du condition] -11 - 201042600. In addition, the initial luminance can be maintained by changing the pulse width while the driving time is increased. Therefore, since the driving voltage can be lowered while obtaining the same brightness, the life of the fluorescent display tube can be increased. The present invention has been made based on such an understanding. Fig. 5 to Fig. 16 show the results of measurement of the dependence of the luminous efficiency on the pulse width. Figs. 5 to 12 are examples of phosphors in which the luminous efficiency is increased if the pulse width tp is shortened. Figs. 13 to 16 are diagrams showing examples of the phosphor which does not change the luminous efficiency even if the pulse width tp is changed. The above measurement was carried out by the following method. After coating various low-speed electron beam phosphors on the carbon anode of the fluorescent display tube, the tubes are processed into a tube ball by a known fluorescent tube manufacturing process. In the phosphor other than ZnO: Ζι, in order to prevent charging, Ιη203 having high conductivity is mixed, and the total amount of Ιη203 mixed with respect to the phosphor and Ιη203 is about 10% by weight. The filament cathode was energized, and the anode/gate electrode (ebc) was changed to 50 VPP while heating to about 650 ° C, and Du and the pulse width tp were changed, and the luminous efficiency characteristics were measured. Further, the luminance was measured, and the luminance 値 of the pulse width tp of 250 pSeC was taken as 100, and the relative enthalpy was used to indicate the luminous efficiency. As shown in Fig. 5 to Fig. 12, the phosphor is SrTi03: Pr (Fig. 5), Gd202S: Eu (Fig. 6), CaTi03: Pr (Fig. 7), and ZnS: Μη (Fig. 8) ), ZnGa204 : Μη (Fig. 9), ZnGa204 (Fig. 10), and Y202 S: Eu (Fig. 11), if the pulse width is shortened, the luminous efficiency is greatly increased. In addition, Fig. 12 -12 - 201042600 shows an example of ZnS : Μ π as an example when the anode/gate electrode (ebc ) is 35 Vpp. Even when the anode/gate electrode (ebc) is 35 Vpp lower than 5 〇 Vpp, if the pulse width is shortened, the luminous efficiency is greatly increased. On the other hand, as shown in Fig. 13 to Fig. 16, the phosphor is ZnO: Zn (Fig. 13), ZnS: Ζη (Fig. 14), ZnS: Cu, A1 (Fig. 15), B. 11〇(13: When §(〇(13,70重量%) (16th 〇图)) Even if the pulse width is shortened, the luminous efficiency does not increase, and the dependence on the pulse width is not seen. The tendency is at the anode/gate The same applies to the case where the electrode (ebc) is 35 VPP. In the measurement shown in Figs. 5 to 16 described above, although the pulse width and degree (period) are changed, the anode/gate electrode (ebc) is the same as Du. The current (anode current) flowing into the phosphor is substantially constant. Therefore, the dependence of the luminous efficiency is the same as the dependence of the luminance. Fig. 7 shows the dependence of the anode current on the pulse width in the ZnO:Zn phosphor. 1 8 Figure 〇 shows the dependence of the anode current on the pulse width in ZnS: Μη phosphor, but the anode current in both does not depend on the pulse width. In dynamic driving, compare the luminous efficiency if the pulse width tp is shortened. Rising phosphors and phosphors that do not exhibit pulse width dependence. It is seen that the former is mainly a phosphor having a localized luminescent center having at least one luminescent center of a transition metal ion luminescent center and a rare earth ion illuminating center, and the latter is a phosphor having a non-local illuminating center. Further, a pulse voltage of the input waveform shown in FIG. 19 is applied to the two phosphors, and after the luminance of the phosphor is saturated, the tendency of the saturation luminance 値 after the voltage application stops-13-201042600 is investigated. The results are shown in Tables 1 and 2, and FIG. 19 is a diagram showing the rise time tr of the light emission of the phosphor and the fall time tf after the voltage application is stopped when the pulse voltage is applied to the anode of the fluorescent display tube. For the anode/gate electrode (ebc) of 5 〇Vpp and the pulse width tp of lmsec ', the time to decrease to 1饱和% of the saturation brightness 测定 was measured as the "falling time tf". [Table 1] Egg light body ZnS: Μη SrTi 〇3 :Pr —— CaTi03:Pr Gd707S: Eu Y707S:Eu ZnG3^〇4 ZnGa7〇4:Mn Fall time ((4)C) 1690 480 360 1100 1200 290 5000 [Table 2] II Fluorescent ZnO: Zn ZnS: Zn 2nS: Cut Al ZnCdS: When Ag I landed (#sec) 20 100 100 80 As shown in Table 2, the drop time of the phosphor group which does not exhibit pulse width dependence is 100 μsec or less, as shown in Table 1, When the pulse width tp is shortened, the fall time of the phosphor group in which the luminous efficiency is increased is also 290 psec. The phosphor which can be used in the present invention is a phosphor which has a high luminance when the pulse width is shortened under the same dynamic driving, and is a phosphor having a falling time of more than 100 psec, and preferably has a landing time of 200 psec or more. The phosphor is more preferably a phosphor having a landing time of 290 psec or more. Further, a phosphor exhibiting such characteristics is mainly a phosphor having a localized luminescent center having at least one of a transition metal ion luminescence center and a rare earth ion luminescence center at the center of illuminating -14 - 201042600. As the luminescent center, preferably, it is a Μn ion, a Pr ion, an Eu ion or a Tb ion. As the precursor of the phosphor, it is Cai_xSrxTi03 ( O^xSl ), L112O2S (Ln means Y, La, Gd or Lu), L112O3 (Ln represents Y, La, Gd or Lu), ZnGa2〇4, Z112 S iO4, Z112GeO4, Sn02, ZnS or CaS. Specific examples of the phosphor include ZnS: Μn phosphor (0 orange), ZnGa204: Μη (green), SrTi03: Pr (red), CaTi03: Pr (red), and Gd202S: Eu (red). Y2〇2S : Eu (red), Y203 : Eu (red), ZnGa204 (blue), La202 S : Eu (red), Sn02 : Eu (orange), Zn2Si04 : Μη (green) ' Gd202S : Tb (green), CaS : Μη (orange), ZnS: Au, Α1 (green), etc. The phosphor which can be used in the present invention has a low number of luminescent centers in the excitation region of the electron beam and a low rate of migration from the excited state to the basal state. Therefore, in the case where the pulse width tp is long, the excitation/emission process becomes saturated, and the luminance (luminous efficiency) is lowered. On the contrary, if the pulse width tp is short, the luminance (light-emitting efficiency) is considered to be relatively increased. The dynamic driving of the present invention is to use the above-described phosphor group in which the luminance is increased by shortening the pulse width tp under the same conditions of the DU. Since the brightness is increased if the pulse width is shortened, with such a phosphor, the pulse width .tp and the pulse repetition period T can be varied in the direction in which the initial luminance is maintained while the driving time is increased. Since the brightness of the phosphor is lowered in most cases while the driving time is increased, specifically, while the driving time is increased, the pulse width -15 - 201042600 degrees tp and the repetition period T of the pulse are compared with the tp at the start of driving. And T is short. The shortening of tp and Τ is performed while maintaining the identity of Du. Further, the anode voltage and the gate voltage are maintained while the two voltages at the start of driving are maintained. In order to shorten the tp and T while increasing the driving time, it is possible to set, for example, the following in a known method in which the driving accumulation time is accumulated and maintained in the nonvolatile memory provided in the driving circuit of the fluorescent display tube. The type of the light body, the lighting ratio, and the like, the pulse width and period are changed by the controller after a predetermined time has elapsed. By such a condition, the dynamic driving of the present invention can correct the brightness in the direction of maintaining the initial luminance without increasing the energy of electrons colliding with the phosphor, increasing the number of electrons, and increasing the power consumption. Further, since the energy of the electrons is not increased and the number of electrons is increased, the deterioration of the phosphor is not accelerated, and the life of the fluorescent display tube is improved. In addition, power consumption will not increase. In addition, in the dynamic driving using the above-described phosphor having a local type illuminating center, the luminous efficiency when the anode/gate electrode (ebc) in FIG. 5 to FIG. 2 is 50 Vpp 'Du is (1/50) The results of the dependence on the pulse width (brightness) are summarized in Tables 3 and 4. Table 3 is a summary of phosphors having a localized luminescence center whose luminance is improved by shortening the pulse width tp, and Table 4 is a summary of phosphors having non-local luminescence centers which exhibit no pulse width dependency. . -16- 201042600 [Table 3] Dependence of brightness on pulse width -1 (ebc = 50VPP, DU = 1/50) Pulse width (U sec) Period (msec) SrTi03: Pr, AI Gd2 〇 2S: Eu CaTi03: Pr ZnS:Mn ZnGaz04:Mn ZnGa2〇4 ZnS:Au, Al 250 12.5 100 100 100 100 100 100 100 200 10 105 107 108 101 108 104 101 150 7.5 115 116 120 115 119 109 102 100 5 132 132 141 142 130 119 105 80 4 140 141 152 157 134 124 106 60 3 154 152 173 183 140 131 110 40 2 173 165 195 208 147 43 114 20 1 198 182 230 247 149 161 124 10 0.5 203 192 244 266 150 179 131 5 0.25 198 190 236 261 145 186 135 [Table 4] Dependence of brightness on pulse width-2 (ebc = 50VPP, Du 彳 / 50) Pulse width (/ / sec) Period (msec) ZnO: Zn 2nCdS: Ag (CdS70wt%) ZnS: Zn ZnS; Cu, Al 250 12.5 100 100 100 100 200 10 99 102 99 101 150 7.5 99 102 101 102 100 5 100 102 102 102 80 4 101 103 102 105 60 3 100 104 103 105 40 2 101 106 104 107 20 1 102 108 106 108 10 0.5 106 109 107 109 5 0.25 107 108 107 108

As is apparent from Table 3, in the dynamic display method of the present invention, in the fluorescent display tube using the phosphor mainly having the local-type light-emitting center, the pulse repetition period T is 7.5 msec or less, preferably 7.0~. 0.5 msec, and the pulse width tp is 150 Msec or less, preferably 10 to 15 (^Sec mode is driven. If the pulse repetition period T exceeds 7.5 msec, and the pulse width tp exceeds 150 psec, improvement in brightness cannot be expected. 201042600 Example (Example 1 and Comparative Example 1) A phosphor obtained by adding 10% by weight of Ιη203 to ZnS: Μη (orange) was applied to a carbon anode of a fluorescent display tube, and then displayed by a known fluorescent display. The tube manufacturing process was processed into a tube-shaped ball. The obtained fluorescent display tube was lit under the conditions of an anode/gate electrode (ebc) of 50 VPP and a Du of 1/60, and the brightness retention ratio was measured. The results are shown in Fig. 20. Comparative Example 1 is a conventional driving method in which the pulse width tp is fixed at 250 μ3' and the repetition period τ is fixed at 15 msec, and the luminance maintenance ratio of the fluorescent display tube is measured. In the first embodiment, the pulse width at the start of lighting is measured. Tp is 250 'repeated week The period τ is 15 msec, but while the lighting time is increased, 'the condition that Du is 1/60 is maintained, and tp and T are respectively shortened. Table 5 shows the t of tp and T which change after each time has elapsed. As shown in the figure, the initial luminance of Comparative Example 1 was largely lowered, and the initial luminance was maintained in Example 1. In addition, the luminance maintenance ratio was improved from 87% of Comparative Example 1 after 117 hours from the start of lighting. 97% of Example 1; after 530 hours, the brightness maintenance rate improved from 79% of Comparative Example 1 to 102% of Example 1; after 10 hours, the brightness maintenance rate was from the comparative example 7 5 % improved to 95% of Example 1. (Example 2 and Comparative Example 2) Coating on a carbon anode of a fluorescent display tube in CaTi03: pr (red) -18- 201042600 Added 1 〇% by weight of In203 The obtained phosphor is processed into a tube spherical shape by a known fluorescent display tube manufacturing process, and the obtained fluorescent display tube is lit with an anode/gate electrode (ebc) of 50 VPP' Du of 1/60. The brightness maintenance ratio was measured. The results are shown in Fig. 21. Comparative Example 2 is a conventional driving method, and the pulse width is set. The tp was fixed at 250 ps, the repetition period T was fixed at Hmsec, and the luminance maintenance ratio of the fluorescent display tube was measured. In the second embodiment, the pulse width tp at the start of lighting was 250 ps, and the repetition period T was 15 msec'. The conditions of maintaining D u of 1 / 60 while the lighting time is increased are shortened by tp and T, respectively. Table 5 shows the t of tp and T after the increase of each time. As shown in Fig. 2, the initial luminance of Comparative Example 2 was greatly lowered, and the decrease in the initial luminance of Example 2 was smaller than that. In addition, the brightness maintenance rate improved from 75 % of Comparative Example 2 to 91% of Example 2 after 48 hours from the point ;; after 170 hours, the 〇 brightness maintenance rate was 60 0 of Comparative Example 2. % improved to 84% of Example 2; after 530 hours, the brightness maintenance rate improved from 52% of Comparative Example 2 to 80% of Example 2; after 1 000 hours, the brightness maintenance rate was changed from Comparative Example 46% of 2 improved to 80% of Example 2. (Example 3 and Comparative Example 3) A phosphor obtained by adding 14 wt% of In2〇3 to Gd202S: Eu (red) was applied to a carbon anode of a fluorescent display tube, and a known fluorescent display tube was used. The manufacturing process is processed into a tube sphere. -19- 201042600 The obtained fluorescent display tube was lit under the conditions of an anode/gate electrode (ebc) of 50 Vpi and a Du of 1/60, and the luminance maintenance ratio was measured. The results are shown in Fig. 22. Comparative Example 3 is a conventional driving method in which the capillary width maintenance ratio of the fluorescent display tube was measured by fixing the pulse width tp to 25 〇ps and fixing the repetition period T to 15 msec. In the third embodiment, the pulse width tp at the start of lighting is 250 ps, and the repetition period T is 15 msec', but while the lighting time is increased, the condition of maintaining Du at 1/60 is shortened by tp and T, respectively. Table 5 shows the enthalpy of tp and T after each time increase. As shown in Fig. 2, Comparative Example 3 was greatly reduced from the initial luminance, and Example 3 maintained the initial luminance as compared with Example 3. In addition, the brightness maintenance rate was improved from 92% of Comparative Example 3 to 100% of Example 3 after 48 hours from the start of lighting; after 1 70 hours from the start of lighting, the brightness maintenance ratio was changed from Comparative Example 3 80% improved to 96% of Example 3; after 530 hours, the brightness maintenance rate improved from 69% of Comparative Example 3 to 96% of Example 3; after 100 hours, brightness The maintenance rate improved from 57% of Comparative Example 3 to 94% of Example 3. (Example 4 and Comparative Example 4) A phosphor obtained by adding 1 〇% by weight of Ιη203 to SrTiO03: Pr (red) was applied to a carbon anode of a camping display tube, and then produced by a known fluorescent display tube. The process is processed into a tube sphere.

The obtained fluorescent display tube was lit under the conditions of an anode/gate electrode (ebc) of 50 VPP -20-201042600 and a DU of 1/60, and the luminance maintenance ratio was measured. The results are shown in Fig. 23. Comparative Example 4 is a conventional driving method in which the pulse width tp is fixed at 25 0 μ8, the repetition period τ is fixed at 15 msec, and the luminance maintenance ratio of the fluorescent display tube is measured. In the fourth embodiment, the pulse width tp at the start of lighting is 25 Ops, and the repetition period T is 15 msec. However, while the lighting time is increased, the condition of maintaining Du at 1/6 ' is shortened by tp. And T. Table 5 shows the enthalpy of tp and T after each time increase. As shown in Fig. 2, the initial luminance of Comparative Example 4 was greatly lowered. The initial luminance reduction of Example 4 was smaller than that of Comparative Example 4. Further, after 48 hours from the start of lighting, the brightness maintenance ratio was improved from 77% of Comparative Example 4 to 104% of Example 4; after 170 hours, the brightness retention rate was improved from 5.2% of Comparative Example 4 to implementation. 8 3 % of Example 4; After 530 hours, the brightness retention rate improved from 39% of Comparative Example 4 to 70% of Example 4; after 1 hour, the brightness retention rate was compared from the comparative example. 32% of 4 improved to 63% of Example 4. (Example 5 and Comparative Example 5) A phosphor obtained by adding 10% by weight of Ιη203 to ZnGa2〇4: Μη (green) was applied to a carbon anode of a camping display tube, and then displayed by a known fluorescent display. The tube manufacturing process is processed into a tube sphere. The obtained fluorescent display tube was lit under the conditions of an anode/gate electrode (ebc) of 50 VPP and a Du of 1/60, and the luminance maintenance ratio was measured. Results Table -21 - 201042600 is shown in Figure 24. Comparative Example 5 is a conventional driving method in which the pulse width tp is fixed at 250 and the repetition period T is fixed at 15 msec, and the luminance maintenance ratio of the fluorescent display tube is measured. In the fifth embodiment, the pulse width tp at the start of lighting is 250 ps and the repetition period T is 15 msec. However, while the lighting time is increased, the condition that Du is 1/60 is maintained, and tp and T are shortened, respectively. Table 5 shows the enthalpy of tp and T after each time increase. As shown in Fig. 24, the initial luminance of Comparative Example 5 was largely lowered, and Example 5 maintained the initial luminance as compared with FIG. Further, after 48 hours from the start of lighting, the luminance maintenance ratio was improved from 88% in Comparative Example 5 to 96% in Example 5; after 170 hours from the start of lighting, the luminance maintenance ratio was changed from the comparative example. 85% of 5 improved to 10% by weight of Example 5; after 1000 hours, the brightness maintenance rate improved from 72% of Comparative Example 5 to 97% of Example 5. [table 5]

- an initial 値 48 hours after 170 hours, 530 hours after 1000 hours, after 1000 hours tp (/ / sec) T (msec) tp (/isec) T (msec) tp (^sec) T (msec) tp (/ / sec) T(msec) tp(^sec) T(msec) *Example 1 250 15 250 15 200 12 150 9 150 9 Example 2 150 9 100 6 80 4.8 60 3.6 *Example 3 200 12 150 9 100 6 40 2.4 Example 4 100 6 60 3.6 40 2.4 20 1.2 Example 5 200 12 150 9 150 9 100 6 Comparative Example 5 250 15 250 15 250 15 250 15 250 丨 5 I (Example 6 and Comparative Example 6) The carbon anode of the display tube was coated with about 10% by weight of SrTi〇3:pr phosphor of -22-201042600 ϊη〇3, and then processed into a tube spherical shape by a known fluorescent display tube manufacturing process. The obtained fluorescent display tube is illuminated by a dynamic driving method. The condition is that when Du is (1 / 60), the condition a and the condition B which are the same brightness are bright. The condition A is Comparative Example 6 as a conventional example, in which the anode/gate electrode (ebc) is 5 〇 Vpp and the pulse width tp is 25 (^s, and the repetition period T of the pulse is 15 msec. In contrast, the condition Β is based on In the driving method of the invention, the anode/gate electrode (ebc) is 40 Vpp, the pulse width tp is 80 ps, and the pulse repetition period τ is 4.8 msec. The luminance lifetime when the condition A and the condition B are lit is expressed in In the case of the condition B of the method according to the present invention, since both the anode voltage and the anode current can be lowered, the brightness maintenance ratio is improved and the fluorescent display tube is improved as compared with the conventional driving condition A.寿命 (Example 7 and Comparative Example 7) After coating a CaTi〇3: Pr phosphor of about 10% by weight of In2〇3 on a carbon anode of a fluorescent display tube, 'using a known fluorescent display The tube manufacturing process is processed into a tube shape. The obtained fluorescent display tube is illuminated by a dynamic driving method, provided that when Du is (1 / 60 ), the condition c and the condition d are lit with the same brightness. As Comparative Example 7 of the prior art, the anode/gate electrode (eb c ) was 50 Vpp. The pulse width tp is 25 〇μ8, and the repetition period τ of the pulse is 15 msec. On the other hand, the condition D is the driving method according to the present invention. -23-201042600 Example 7 'The anode/gate electrode (ebc) is 35 Vpp, The pulse width tp is 40 ps, and the repetition period T of the pulse is 2.4 msec. The luminance lifetime when the condition C and the condition D are lit is shown in Fig. 26 in the case of the condition D according to the method of the present invention, due to the anode voltage, Since the anode current can be lowered, the brightness maintenance rate is improved and the lifetime of the fluorescence is improved as compared with the condition C. INDUSTRIAL APPLICABILITY The driving method of the present invention can obtain a fluorescent display tube of high brightness. Since it is possible to reduce the power consumption and extend the life, it can be applied to a fluorescent display tube using a phosphor having a remarkable brightness saturation. [Simplified Schematic] Fig. 1 is a cross-sectional view of a fluorescent display tube. It is a timing chart in the dynamic driving method. Fig. 3 is a graph showing the dependence of the luminous efficiency on Du in the Zn.O:Zn phosphor. Fig. 4 is a graph showing the luminous efficiency in the ZnS:Μη phosphor. Diagram of Du's dependence. 5 is a graph showing the dependence of the luminous efficiency of the SrTiO 3 : Pr phosphor on the pulse width. Fig. 6 is a graph showing the dependence of the luminous efficiency of the Gd202 S : Eu phosphor on the pulse width. -24- 201042600 Fig. 7 is a graph showing the dependence of the luminous efficiency of the CaTi03 : Pr phosphor on the pulse width. Fig. 8 is a graph showing the dependence of the luminous efficiency of the ZnS : Μn phosphor on the pulse width. A graph showing the dependence of the luminescence efficiency of ZnGa204: Μn phosphor on the pulse width. Fig. 1 is a graph showing the dependence of the luminous efficiency of the ZnGa204 phosphor on the pulse width of 0 degree. Fig. 1 is a graph showing the dependence of the luminous efficiency of the Y202s : Eu phosphor on the pulse width. Fig. 12 is a graph showing the dependence of the luminous efficiency of the ZnS: Μn phosphor on the pulse width. Fig. 13 is a graph showing the dependence of the luminous efficiency of the ZnO : Ζn phosphor on the pulse width. Fig. 14 is a graph showing the dependence of the luminous efficiency of the ZnS: Ζn phosphor on the pulse width. Fig. 15 is a graph showing the dependence of the luminous efficiency of the ZnS:Cu and Α1 phosphors on the pulse width. Fig. 16 is a graph showing the dependence of the luminous efficiency of the ZnCdS : Ag phosphor on the pulse width. Fig. 17 is a graph showing the dependence of the anode current on the pulse width in the ZnO : Zn phosphor. The figure is a graph showing the dependence of the anode current on the pulse width in the ZnS: Μn phosphor. -25- 201042600 Fig. 19 is a view showing the rise time tr and the fall # between the phosphors of the phosphor. Figure 20 is a graph showing the luminance lifetime of a ZnS: Μn phosphor. Fig. 21 is a graph showing the luminance lifetime of the CaTi03: Pr phosphor. Fig. 22 is a graph showing the luminance lifetime of the Gd202S: Eu phosphor. Fig. 23 is a graph showing the luminance lifetime of the SrTi03: Pr phosphor. Figure. Fig. 24 is a graph showing the luminance lifetime of a ZnGa204 : Μn phosphor. Fig. 25 is a graph showing the luminance lifetime of the SrTiO 3 : Pr phosphor having an initial luminance. Fig. 26 is a graph showing the luminance lifetime of a CaTi〇3 : Pr phosphor having an initial luminance. [Description of main component symbols] 1 : Egg light display tube 2: Glass substrate 3 : Wiring layer 4 : Insulation layer 5 : Anode electrode 6 : Phosphor layer 7 : Anode substrate 8 : Gate 9 : Cathode 1 〇: Front glass 1 1 : Isolation glass-26-

Claims (1)

201042600 VII. Patent application: 1. A method for driving a fluorescent display tube, which is displayed by dynamically driving a phosphor layer formed on an anode electrode under low-speed electron beam excitation, and is characterized by: The phosphor included in the bulk layer is a phosphor having a higher luminance when the pulse width is shortened under the condition that the task cycle is the same under the dynamic driving, and a voltage is applied to the anode electrode in the phosphor 0. After the brightness is saturated, the phosphor having a 10% brightness 値 of the saturation brightness 値 after the voltage application is stopped is 200 pSec or more; the dynamic driving is a fixed anode voltage, a gate voltage, and a task cycle 'utilizing the pulse width Or the 重复 of the repetition period of the pulse controls the brightness to drive. 2. The method of driving a fluorescent display tube according to claim 1, wherein the pulse width or the repetition period of the pulse is increased in driving time for the pulse width or the repetition period of the pulse. At the same time, it can be changed in the direction in which the brightness of the above phosphor is maintained. 3. The method of driving a fluorescent display tube according to claim 2, wherein the brightness of the phosphor is an initial brightness. 4. The method of driving a fluorescent display tube according to claim 1, wherein the anode voltage, the gate voltage, and the duty cycle are 値 at the start of driving. The method for driving a fluorescent display tube according to the first aspect of the invention, wherein the pulse width or the repetition period of the pulse is 7.5 msec or less and the pulse is repeated. Drive with a width of 15 〇 Hsec or less. 6. The method of driving a fluorescent display tube according to claim 1, wherein the precursor of the phosphor is Cai-xSrxTi03, OSxSl; Ln202S, and Ln represents Y, La, Gd or Lu; Ln2〇3 Ln represents Y, La, Gd or Lu; ZnGa2〇4; Zn2 SiO4; ZnjGeOA '>Sn02; ZnS or CaS. The method of driving a fluorescent display tube according to claim 1, wherein the phosphor is a phosphor having a localized luminescent center. 8. The method of driving a fluorescent display tube according to claim 1, wherein the phosphor is a camping light having at least one of a transition metal ion luminescence center and a rare earth luminescence center. body. 9. The method of driving a fluorescent display tube according to claim 8, wherein the luminescent center is Μn ions, Pr ions, Eu ions or Tb ions. The method for driving a fluorescent display tube according to the first aspect of the invention, wherein the phosphor is from ZnS: Mn' ZnGa204: Mn' SrTi03: -28 - 201042600 Pr, CaTi03 : Pr, Gd2 〇2S : Eu, Y2〇2: Gd2〇2S : Tb ' Y2O3 : Eu ' La202S : Zn2Si〇4 : Mn ' CaS : Mn, and ZnS : Au A phosphor. 11. A fluorescent display tube that ejects a low-speed electron beam to a phosphor layer formed in a vacuum volume, and emits light by a bulk layer, wherein: the phosphor contained in the phosphor layer is set to have the same task cycle Under the condition that if the high phosphor is shortened and the brightness applied to the anode electrode is saturated, the time to decrease the 10% brightness 该 to the voltage application stop 为 is 200 卜 86 (: Above | The above dynamic drive is For example, the patent application scope method is as follows: 1 2 · The 萤 described in the scope of claim 1 is ZnS: Mn, ZnGa Pr ' CaTi03 : pr ' Gd202S : Eu , Y2 〇 2 Gd202S : Tb, Γ2〇3 : Eu, La202S : Zn2Si04: Mn, CaS: Mn, and ZnS: Au A phosphor. 3 : Eu, ZnGa2〇4, Eu, Sη〇2: Eu, A1, at least selected in the device Dynamically driving the anode electrode to illuminate the phosphor in the above-mentioned dynamic driving, wherein the brightness is increased by the pulse width, and the phosphor of the saturated brightness after the phosphor; the driving side fluorescent display tube of the item 1, wherein 〇4: Mn,SrTi〇3 : » · Eu,ZnGa2〇4 Eu 'Sn〇2: Eu 5, A1 selected from at least -29